A later post on SN shared the above Tweet as well.

*Coldcard Mk4 - NFC demo*
https://stacker.news/items/16602
https://twitter.com/eh_deee/status/1507820692401709057

cryptocoin

bitcoin

🎥 Demonstration of transferring data from NFC-equipped COLDCARD wallet MK4 to mobile | @econoalchemist

Another demonstration:

> Its time to show off [@Coinkite](https://twitter.com/Coinkite)’s newest [@COLDCARDwallet](https://Twitter.com/COLDCARDwallet), the Mk4 🔥🔥🔥 In this quick video tutorial, I go through the process of extracting a wallet address from the hardware device onto a mobile phone. Take a look! 👀
>
> [Video]

https://twitter.com/eh_deee/status/1507820692401709057